Angular template engine clone

type TemplateType = {
  template: string;
  id: string;
};

function withTemplate(templateObj: TemplateType) {
  return function (constructor: any) {
    let el = document.getElementById(templateObj.id);
    let p = new constructor();
    if (el) {
      let content = templateObj.template.replace(/{{\w+}}/g, function (a1) {
        let property = a1.replace("{{", "").replace("}}", "");
        return p[property];
      });
      el.innerHTML = content;
    }
  };
}

@withTemplate({ template: `<h1>Name: {{name}}, Age: {{age}}</h1>`, id: "app" })
class Person {
  name = "tuan anh";
  age = 28;
}